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need a little help on water parameters please

Hi as the title says I need a little help I am preparing my tank for discus, it has been running for a while now with tetras my water parameters are pH 7.6, higher pH7.4, ammonia 0, nitrite 0, nitrate 5ppm, GH 6 degrees and KH 3 degrees, TDS 131ppm. the pH I feel is too high for discus as all I have read says 6.5-6.8, but mine is stable always the same no matter what, I am using RO/DI water with one scoop tropic marin re-min (my tap water is 19 degrees GH and 12 degrees KH with TDS 243ppm and on a good day 20-40ppm nitrate) hence the RO, so my main question is will discus be ok in what I've got or do I try to lower the pH? if so I am thinking peat pellets in the filter would it work? thank you in advance.

If you have harder water then choose discus that are happy to live in these conditions. Call or visit Devotedly Discus https://www.devotedly-discus.co.uk/ Talk to Mark, he is a personal friend, who will give you all the advice you need. He also has some great Stendker fish.